Sayyiduna Jarir (may Allah be pleased with him) said: the Messenger of Allah (peace and blessings be upon him) said: "I have been commanded to fight the people until they say, 'There is no god worthy of worship except Allah.' When they say it, they have protected their lives and wealth from me, except by its right, and their reckoning rests with Allah, the Mighty and Majestic."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 2263